scholarly journals Externally calibrated parallel imaging for 3D multispectral imaging near metallic implants using broadband ultrashort echo time imaging

2016 ◽  
Vol 77 (6) ◽  
pp. 2303-2309 ◽  
Author(s):  
Curtis N. Wiens ◽  
Nathan S. Artz ◽  
Hyungseok Jang ◽  
Alan B. McMillan ◽  
Scott B. Reeder
Keyword(s):  
Parallel Imaging ◽  
Multispectral Imaging ◽  
Ultrashort Echo Time ◽  
Metallic Implants ◽  
Echo Time

scholarly journals Outracing Lung Signal Decay – Potential of Ultrashort Echo Time MRI

2018 ◽  
Vol 191 (05) ◽  
pp. 415-423 ◽  
Author(s):  
Mark Wielpütz ◽  
Simon Triphan ◽  
Yoshiharu Ohno ◽  
Bertram Jobst ◽  
Hans-Ulrich Kauczor
Keyword(s):  
Parallel Imaging ◽  
Proton Density ◽  
Ultrashort Echo Time ◽  
The Past ◽  
Signal Decay ◽  
Database Research ◽  
Pulmonary Parenchyma ◽  
Echo Time ◽  
Multiple Challenges ◽  
Magnetic Resonance Imaging Mri

Background Magnetic resonance imaging (MRI) of the pulmonary parenchyma is generally hampered by multiple challenges related to patient respiratory- and circulation-related motion, low proton density and extremely fast signal decay due to the structure of the lungs evolved for gas exchange. Methods Systematic literature database research as well as annual participation in conferences dedicated to pulmonary MRI for more than the past 20 years by at least one member of the author team. Results and Conclusion The problem of motion has been addressed in the past by developments such as triggering, gating and parallel imaging. The second problem has, in part, turned out to be an advantage in those diseases that lead to an increase in lung substance and thus an increase in signal relative to the background. To reduce signal decay, ultrashort echo time (UTE) methods were developed to minimize the time between excitation and readout. Having been postulated a while ago, improved hardware and software now open up the possibility of achieving echo times shorter than 200 µs, increasing lung signal significantly by forestalling signal decay and more effectively using the few protons available. Such UTE techniques may not only improve structural imaging of the lung but also enhance functional imaging, including ventilation and perfusion imaging as well as quantitative parameter mapping. Because of accelerating progress in this field of lung MRI, the review at hand seeks to introduce some technical properties as well as to summarize the growing data from applications in humans and disease, which promise that UTE MRI will play an important role in the morphological and functional assessment of the lung in the near future. Key Points:  Citation Format

scholarly journals Accelerated Stack-of-Spirals Free-Breathing Three-Dimensional Ultrashort Echo Time Lung Magnetic Resonance Imaging: A Feasibility Study in Patients With Breast Cancer

2021 ◽  
Vol 11 ◽  
Author(s):  
Min Jae Cha ◽  
Hye Shin Ahn ◽  
Hyewon Choi ◽  
Hyun Jeong Park ◽  
Thomas Benkert ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Image Quality ◽  
Parallel Imaging ◽  
Three Dimensional ◽  
Free Breathing ◽  
Resonance Imaging ◽  
Ultrashort Echo Time ◽  
Echo Time

PurposeTo investigate the clinical feasibility of accelerated free-breathing stack-of-spirals (spiral) three-dimensional (3D) ultrashort echo time (UTE) lung magnetic resonance imaging (MRI) using iterative self‐consistent parallel imaging reconstruction from arbitrary k‐space (SPIRiT) algorithm in patients with breast cancer.MethodsThe institutional review board approved this prospective study and patients’ informed consents were obtained. Between June and August 2018, 29 female patients with breast cancer underwent 3-T MRI including accelerated free-breathing spiral 3D UTE (0.98-mm isotropic spatial resolution; echo time, 0.05 msec) of the lungs and thin-section chest computed tomography (CT). Two radiologists evaluated the image quality and pulmonary nodules on MRI were assessed and compared, CT as a reference.ResultsThe pulmonary vessels and bronchi were visible consistently up to the sub-sub-segmental and sub-segmental branch levels, respectively, on accelerated spiral 3D UTE. The overall image quality was evaluated as good and excellent for 70.7% of accelerated spiral 3D UTE images (reviewer [R]1, 72.4% [21/29]; R2, 69.0% [20/29]) and acceptable for 20.7% (both R1 and R2, 20.7% [6/29]). Five patients on CT revealed 141 pulmonary metastatic nodules (5.3 ± 2.6 mm); the overall nodule detection rate of accelerated spiral 3D UTE was sensitivity of 90.8% (128/141), accuracy of 87.7%, and positive predictive value of 96.2%. In the Bland-Altman plot analysis comparing nodule size between CT and MRI, 132/141 nodules (93.6%) were inside the limits of agreement.ConclusionAccelerated free-breathing spiral 3D UTE using the SPIRiT algorithm could be a potential alternative to CT for oncology patients.

scholarly journals Clinical application of ultrashort echo-time MRI for lung pathologies in children

2021 ◽  
Author(s):  
J. Geiger ◽  
K.G. Zeimpekis ◽  
A. Jung ◽  
A. Moeller ◽  
C.J. Kellenberger
Keyword(s):  
Clinical Application ◽  
Ultrashort Echo Time ◽  
Echo Time

PP-0120 Applicator visualization using ultrashort echo time MRI for HDR endorectal brachytherapy

2021 ◽  
Vol 158 ◽  
pp. S89-S90
Author(s):  
E. Kerkhof ◽  
R. van den Ende ◽  
E. Ercan ◽  
R. Keesman ◽  
C. Marijnen ◽  
...  
Keyword(s):  
Ultrashort Echo Time ◽  
Echo Time

scholarly journals A Useful Combination of Quantitative Ultrashort Echo Time MR Imaging and a Probing Device for Biomechanical Evaluation of Articular Cartilage

Biosensors ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 52
Author(s):  
Takehito Hananouchi ◽  
Yanjun Chen ◽  
Saeed Jerban ◽  
Masaru Teramoto ◽  
Yajun Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mr Imaging ◽  
Linear Regression Analysis ◽  
Reaction Force ◽  
Predictor Variable ◽  
Cartilage Tissue ◽  
Magnetization Transfer Ratio ◽  
Ultrashort Echo Time ◽  
Echo Time

In this study, we combined quantitative ultrashort echo time (UTE) magnetic resonance (MR) imaging and an investigation by a probing device with tri-axial force sensor to seek correlations with mechanical properties of human patellar cartilage for in situ evaluation of biomechanical properties. Cartilage blocks (15 × 20 × 5 mm3) were dissected from the patella of six donors; 5 mm square regions of interest from the cartilage blocks were imaged using UTE-MR imaging sequences (T2* and magnetization transfer ratio (MTR)), and mechanical properties were measured using a micro indentation device. Then, the vertical reaction force on the cartilage surface was measured while push-probing forward 3 mm with the probing device at a 30° tilt to the horizontal plane. The results showed a positive correlation between stiffness/elastic modulus and each predictor variable (UTE-T2* (r = 0.240 and 0.255, respectively, UTE-MTR (r = 0.378 and 0.379, respectively), and probing device force (r = 0.426 and 0.423, respectively). Furthermore, multiple linear regression analysis showed the combination of the three predictors had stronger correlation (adjusted r2 = 0.314 (stiffness), 0.323 (elastic), respectively). Our results demonstrate the potential for these non- and less- invasive methods for in situ evaluation of the mechanical properties of cartilage tissue.

scholarly journals Anatomic Evaluation of 3-Dimensional Ultrashort-Echo-Time Bone Maps for PET/MR Attenuation Correction

2014 ◽  
Vol 55 (5) ◽  
pp. 780-785 ◽  
Author(s):  
G. Delso ◽  
M. Carl ◽  
F. Wiesinger ◽  
L. Sacolick ◽  
M. Porto ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Ultrashort Echo Time ◽  
3 Dimensional ◽  
Echo Time
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